Just wondering how do you know if you blew a head gasket or not?

 

Compression test. Do a compression test on all 8. That will tell you if your leaking somewhere in there.

What makes you think you blew a head gasket?

 

compression or leak down test. you can also use a exhaust gas locator in your cooling system.

 

i dont know...like it over heated really bad and also blew a carb fire....just wondering how would you know, how do you do a compression test, a special tool or something?

 

You do need a special tool to do a compression test. There are a lot of compression testers on the market. You want one that screws into the spark plug hole and has a hose, rather than the kind that you have to hold in the hole. Sears sells a kit that fits most cars.